package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.exception.BussinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.yupi.yupicturebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author HU
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-08-05 14:22:44
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    /**
     * 用户注册
     *
     * @param userAccount   用户账户
     * @param userPassword  用户密码
     * @param checkPassword 校验密码
     * @return 新用户 id
     */
    @Override
    public Long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }

        // 2. 账户不能重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = this.count(queryWrapper);
        if (count > 0){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 3. 密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4. 插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("小可爱");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean save = this.save(user);
        if (!save){
            throw new BussinessException(ErrorCode.OPERATION_ERROR, "注册失败");
        }
        return user.getId();
    }


    /**
     * 获取加密密码
     *
     * @param userPassword
     * @return
     */
    public String getEncryptPassword(String userPassword) {
        //盐值，随机生成
        final String SALT = "yupi";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    /**
     * 是否为管理员
     *
     * @param user
     * @return
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

    /**
     * 登录
     *
     * @param userAccount  用户账户
     * @param userPassword 用户密码
     * @param request
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword)){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "账号错误");
        }
        if (userPassword.length() < 8){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        // 2. 加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3. 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if (user == null){
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        // 4. 记录登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    /**
     * 获取当前登录用户
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 先判断是否已登录
        User currentUser = (User) request.getSession().getAttribute(USER_LOGIN_STATE);
        if (currentUser == null || currentUser.getId() == null){
            throw new BussinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 从数据库查询（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null){
            throw new BussinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 用户注销
     *
     * @param request
     * @return
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 1. 判断是否已登录
        User currentUser = (User) request.getSession().getAttribute(USER_LOGIN_STATE);
        if (currentUser == null || currentUser.getId() == null){
            throw new BussinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 2. 清空登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);

        return true;
    }

    /**
     * 数据脱敏
     *
     * @return
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null){
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    /**
     * 获取脱敏的单个用户信息
     *
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVO(User user) {
        if (user == null){
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取脱敏的用户列表
     *
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    /**
     * 获取查询条件
     *
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null){
            throw new BussinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortfield = userQueryRequest.getSort();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(id != null, "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.eq(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.eq(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.orderBy(StrUtil.isEmpty(sortfield), sortOrder.equals("ascend"), sortfield);
        return queryWrapper;
    }


}




